A nation that loves cash
The scale of Britain’s preference for cash is striking. Of the roughly 15 million adult ISA accounts open in the 2023/24 tax year, almost 10 million — about two-thirds — were cash ISAs rather than stocks-and-shares ISAs. Vanguard’s research puts the amount of "excess" cash sitting in UK accounts at more than £200 billion, a figure that explicitly excludes money people legitimately need for emergencies or short-term spending. In other words, this isn’t the sensible buffer that financial advisers recommend everyone keep — it’s money that, by Vanguard’s own definition, is doing nothing beyond sitting still.
Reed’s explanation for this is not that people have carefully calculated the odds and concluded cash wins. It’s simpler, and more human, than that. "The status quo feels safe. It doesn’t feel risky," he told MoneyWeek Talks. "But what they don’t realise is that investing is risky, yes. But not investing is also risky."
Rational reserve or behavioral habit?
The trouble with talking about "cash hoarding" is that cash itself is not the villain. Liquidity has genuine value — it is what lets you cover a broken boiler or a period of unemployment without being forced to sell investments at a bad moment. The useful distinction is not "cash versus investing" but between cash that is earmarked for a purpose and cash that simply accumulates because moving it feels like effort, or risk, or both.
| Cash situation | Typical role | When it starts costing you |
|---|---|---|
| Emergency fund (a few months of expenses) | Protects against sudden shocks — job loss, appliance failure | Rarely; this is its intended job |
| Money earmarked for near-term spending (holiday, house deposit within ~2 years) | Avoids market timing risk on money you’ll need soon | Only if held far longer than the actual need |
| Job-loss or income-instability buffer | Gives flexibility to "withstand bumps in the road" | If kept indefinitely well beyond the period of actual risk |
| Balances well above any identified need, held for years | No defined purpose — often just inertia | From day one: it faces both inflation and forgone growth with no offsetting benefit |
This isn’t a precise formula for how much cash any one person should hold — that depends on individual job security, spending needs and time horizon, and no set of general sources can responsibly tell you that number. What the table does show is that the reason cash is being held matters more than the amount in isolation.
The behavioral chain: from fear to a habit
Reed’s account of why cash balloons beyond its useful purpose describes a fairly predictable psychological sequence rather than a deliberate financial plan.
flowchart TD A[Cash feels risk-free] --> B[Investing feels risky by comparison] B --> C[Doing nothing feels safe] C --> D[Status quo bias sets in] D --> E[Inflation erodes purchasing power unnoticed] E --> F[Opportunity cost accumulates over years]
Two behavioral quirks drive this chain. The first is loss aversion: a fall in an investment account feels sharply painful, while inflation’s slow erosion of cash is invisible and therefore easier to ignore. The second is inertia, or status-quo bias — once money lands in a savings account, moving it requires a decision, and decisions can be deferred indefinitely with no obvious penalty. As Reed put it, "inflation is out of sight, out of mind for many people, so they don’t realise the hidden cost of cash."
Why inflation makes "doing nothing" an active choice
This is the part of the story that’s easy to underestimate. A savings account paying 3% interest sounds like a gain. But if inflation is running at 3.5% — roughly where UK inflation stood in the second quarter of 2025, according to the Bank of England — the real, inflation-adjusted return is negative. The Bank has noted that UK inflation has fallen a long way from its 2022 peak of over 11%, but it still expected inflation to rise further, toward around 4% in the months following its August 2025 report, before easing back toward its 2% target. A higher nominal rate on your savings account is not the same thing as a positive real return, and the gap between the two is exactly the "hidden cost" Reed describes.
Nor is this a problem unique to older, more cautious savers. Vanguard research on younger investors found a similar pattern: those under 25 leave around 14% of their retirement account balances sitting in cash, often simply because they forget to invest contributions once they arrive. The mechanism is the same inertia at a different life stage — and for younger savers, with decades of potential compounding ahead, the opportunity cost compounds for longer.
What this doesn’t prove
It would be a mistake to read this as an argument that cash is bad or that every pound not invested is a mistake. Reed himself is explicit that "cash is a story of too much of a good thing" — not an argument for eliminating it. It’s also worth being honest about the limits of the evidence: we don’t know precisely how much of that £200 billion is genuinely idle versus quietly earmarked for near-term needs the research didn’t capture, nor whether today’s preference for cash — boosted by several years of higher interest rates — will persist once rates fall further. Policy changes occasionally floated around ISA allowances may eventually shift some behavior, but nothing in the available evidence shows that any such change will reliably push cash savers into the stock market.
The real question to ask
The useful exercise, then, isn’t "should I hold cash?" — of course you should hold some. It’s a more specific and slightly less comfortable question: does this particular balance have a job to do, or has it simply been sitting there because moving it never felt urgent? Investing carries real risk, and no combination of assets removes it. But as Reed’s framing makes clear, choosing not to decide is also a decision — and inflation doesn’t pause to ask whether it was made on purpose.
